# -*- coding: utf-8 -*-
# リクエストパラメータの変換
module Jpmobile
  class ParamsFilter
    def initialize(app)
      @app = app
    end

    def call(env)
      # 入力
      if @mobile = env['rack.jpmobile'] and @mobile.apply_params_filter?
        # パラメータをkey, valueに分解
        # form_params
        unless env['REQUEST_METHOD'] == 'GET' || env['REQUEST_METHOD'] == 'HEAD'
          unless env['CONTENT_TYPE'] =~ /application\/json|application\/xml/
            env['rack.input'] = StringIO.new(parse_query(env['rack.input'].read))
          end
        end

        # query_params
        env['QUERY_STRING'] = parse_query(env['QUERY_STRING'])
      end

      status, env, body = @app.call(env)

      [status, env, body]
    end

    private
    def to_internal(str)
      ::Rack::Utils.escape(@mobile.to_internal(::Rack::Utils.unescape(str)))
    end
    def parse_query(str)
      return nil unless str

      new_array = []
      str.split("&").each do |param_pair|
        k, v = param_pair.split("=")
        k = to_internal(k) if k
        v = to_internal(v) if v
        new_array << "#{k}=#{v}" if k
      end

      new_array.join("&")
    end
  end
end
